Universal type carburetor



May 22, 1934. H. G. EBERT UNIVERSAL TYPE CARBURETOR Filed Aug. '7, 19332 Sheets-Sheet l lih.

May 22, 19.34. H. G. EBERT UNIVERSAL TYPE ARBRETOR Filed Aug. 7, 1935 2SheetS-Sheet 2 Patented May 22, 1934 1,959,907 UNIVERSAL TYPE CARBURETORHarvey G. Ebert, Cranston, R. I. Application August 7, 1933, Serial No.683,922

9 Claims.

My present invention relates to the carburetor art, and has particularreference to the features o'f construction of a universal typecarburetor.

It is customary to design a carburetor for a particular engine model, aseach model has design Yfeatures that require special carburetorsettings. Moreover, some engine designers prefer upedraft carburetors,and other designers favor down draft carburetors. The expense incidentto carburetor manufacture is thus high, in view of the multiplicity ofconstructions heretofore found necessary; moreover, repair stations havefound it difficult and costly to maintain the necessary replacement andrepair parts. I have therefore devised a carburetor construction whichis readily adaptable for ally types of engines, and which may beutilized for either down or up-draft as desired.

With the aboveA and other objects and advantageous features in view, theinvention consists of a novel arrangement of parts more fully dis closediny the detailed description following, in conjunction with theaccompanying drawings, and more specifically defined in the claimsappended thereto.

Inv the drawings,

Figure 1 is a vertical section through theV improved carburetor,arranged for up-draft;

Figure 2` is a fragmentary side View showing.

the flow control levers;

Figure 3 is a section on the line' 3-3 of Fig ure 1;

Figure 4 is a vertical section through the float chamber;

Figure 5 is a sectional detail on the line 5 5 of Figure 4;

Figures 6 and 7 are perspective views of the upper and lower faces ofthe base plate;

Figures 8 and 9 are perspective views of the upper and lower flangescontacting the base plate;

Figure 10 is a vertical elevation of the air whirl vanes, and

Figure 11 is an elevation showing thecarburetor' changed to provide downdraft.

Referring to the drawings, the novel carburetor includes a float chamberl5, having a float 16 of usual type pivotally mounted in the chamber, asat 1'?, and equipped with an arm 18 for contacting a needle valve 19positioned in a fuel inlet passage 20 and cooperating with a valve seat2l tocontrol the passage of fuelI from the inlet passage to the floatchamber.

A base plate 22 extends laterally from the float chamber, and ispreferably cast integral there` with. The base plate has a circularopening" 23 therethrough, and is provided with concentric grooves 24, 25on the upper face 26, and identical grooves 27, 28 on the lower face 29,the inner y grooves 24, 27 having a plurality of communicat- 60 ingpassages 30; and the outer grooves 26, 28 having at least onecommunicating passage 3l.V As' will be' noted from Figures 1 and 5, onepassage 30 and thepassage 31 are connected with hori-A zontal feed ducts32, 33 which receive fuel from Vertical feed tubes 34, 35 mounted in thefloat chamber, the feed tubes being formed to provide valveseats forclosure valves 36, 37. The closure valve 37 has an auxiliary air passage38 cornmunicating with the atmosphere throughA an opening 39, theauxiliary air flow being controlled by a plug valve 40 adapted to bescrewed down for flow regulation.

Referring to Figurel 1, the carburetor includesr an upper member 4l anda lower member 42 75 whichare reversibly mounted on the base plate, ashereinafter explained. The upper member carries the fuel supply parts,which include two annular plates or rings 43, 44 shaped to provide' ahorizontal supply chamber 45 therebetween, 80 which is fed from theinner groove 24 through'a duct 46,- the rings projecting inwardly andbeingr spaced to form an annular horizontal ow nozzle 47 for dischargingthe fuel in the form of a thin sheet transversely across.

A throttle 48 is positioned in the upper, constric'ted, throat of theVupper member, and an auxiliary feed passage 49, communicating withl thegroove 25 through the aligned ring openings 49a, 49h, has a plurality oftransverse feeds 50, 51 and 52 for ensuring an adequate idling andstarting fuel supply, the feeds 51 and 52 receive ing auxiliary airthrough a plug controlled opening 53. A cam 54 is mounted within thelower part of the upper member; the throttle 48 and the cam 54 haveoperating shafts 55, 56 respectively extending through the upper member,the shafts being operated by a link 57, having a pinl and slotconnection with a link 58, in response: to throttle movement. The link57 is'provided with an adjustable limit stop screw arrangement 59 ofstandard type.

The lower member 42 has a series of slots 60y functioning as air ports,and has" a peripheral recess 61 to receive a cylindrical valve 62v forcontrolling the areas' of the ports, the valve 62 being choke controlledin any suitable manner. A preferred construction is to provide the valvewith a radial projection 68, as by forming the valve* fromv sheet.metal, and by receivingv theprojection in a bifurcated clamp 64 whichcarries a pivot pin 65 on which a hinge member 66 is mounted, the hingemember detachably receiving the choke cable 67. Preferably, the outercable casing 68 is held in a support member 69 secured to the baseplate.

A whirl imparting device '70 is detachably mounted in the upper portionof the lower member, and includes a cylindrical shell '71 with the outerface provided with a plurality of arcuate vanes 72, these vanes beingdesigned to impart a whirling motion to the ascending air, ashereinafter described, and to slightly compress the air prior to passageinto the mixing chamber. The upper end of the shell '71 is formed as avalve seat '73 to receive an auxiliary air valve 74 which is contactedby the cam 54 to limit its upward movement, the stem '75 of the valve'74 extending downwardly through the shell to be detachably secured to apiston '76 seated in a spring housing '77 which is positioned at thelower end of the lower member. A spring '78 is mounted in the springhousing to resiliently press the piston downwardly and thus urge thevalve '74 on its seat; the housing top is provided with the air vents'79 to permit movement of the piston in response to the suction producedby the engine.

The operation of the novel carburetor may now be explained. When' thechoke is closed, the cylindrical air inlet valve closes the air inletports, and the engine receives a very rich mixture. When idling, theengine receives a small quantity of fuel and air through passage 52; asthe throttle is initially opened, fuel and air is fed through passages50, 5l and 52. In normal running, the air enters through the inlet ports60, and divides into two streams, one stream passing around the whirlimparting device to receive a whirling motion and to be slightlycompressed,

` and passing through the fuel sheet from the horizontal nozzle 4'7 toproduce an atomized primary mixture, and the second stream entering theshell '71 and emerging from the upper end of the shell as a conicalsheet of secondary air crossing the initial atomized mixture. The amountof secondary air is controlled by the engine speed and the position ofcam 54, the latter acting as a limit stop and the engine speed producinga suction lift of the piston '76 which in turn shifts the valve '74upwardly.

The above described arrangement thus produces an initial atomizedmixture and a secondary thorough mixture, the draft being up. Since theupper member seats on an annular portion of the base plate, it isevident that the base plate, and therefore the oat chamber, may bereadily turned in relation to the upper member, thus permittingaccommodation to any type of motor, and to either side of the motor.Since the base plate has identical seats for the upper and lowermembers, these members may be readily reversed, the only changenecessary being the provision of suitable accommodation for the throttlecable, which is within the skill of the mechanic.

It is thus evident that the novel carburetor permits a necessary ordesired relative positioning of the mixture inlet and the fioat chamberto permit installation for any type motor, and on either side thereof,and may be set to provide either up or down draft, as desired.

While I have described a specific constructional embodiment of myinvention, it is evident that desired changes in the relativearrangements and proportions of the parts may be made without departingfrom the spirit and the scope of the invention as defined in theappended claims.

I claimt- 1. In a carburetor, a base, a member having an air inlet anddetachably secured to one side of said base, and a second member havinga mixture outlet and detachably secured to the other side of said base,a float chamber, means for conveying fuel from said float chamber tosaid base to form a primary mixture with air from said first member, andmeans for carrying fuel from said float chamber to said second member toform a secondary mixture with air from said first member, said basebeing adapted to detachably receive either member on either sidethereof.

2. In a carburetor, a base having an opening therethrough, a memberdetachably secured to one side of said base and having an air inlet inalignment with said opening, and a second member detachably secured tothe other side of said base and having a mixture outlet in alignmentwith said opening, a float chamber, means for conveying fuel from saidfloat chamber to said opening to form a primary mixture with air fromsaid rst member, and means for carrying fuel from said float chamber tosaid second member to form a secondary mixture with air from said firstmember, said members being interchangeably mountable on either side ofsaid base.

3. In a carburetor, a base having an opening therethrough, a memberdetachably secured to one side of said base and having an air inlet andair whirling means in alignment with said opening, and a second memberdetachably secured to the other side of said base and having a mixtureoutlet in alignment with said opening, a oat chamber, means forconveying fuel from said float chamber to said opening to form a primarymixture with air from said first member, and means for carrying fuelfrom said oat chamber to said second member to form a secondary mixturewith air from said first member, said members being interchangeablymountable on either side of said base. Y

4. In a carburetor, a base having an opening therethrough, a memberdetachably secured to one side of said base and having an air inlet inalignment with said opening, and a second member detachably secured tothe other side of said base and having an air and fuel mixing chamberand a mixture outlet in alignment with said opening, a oat chamber,means for conveying fuel from said float chamber to said mixing chamberto form a primary mixture with air from said Peil ist

first member, and means for carrying fuel from said float chamber tosaid second member to form a secondary mixture with air from said firstmember, said members being interchangeably mountable on either side ofsaid base.

5. In a carburetor, a base having an opening 4 therethrough, a memberdetachably secured to one side of said base and having an air inlet andair whirling means in alignment with said opening, and a second memberdetachably secured to the other side of said base and having an air andfuel mixing chamber and a mixture outlet in alignment with said opening,a iioat chamber, means for conveying fuel from said float chamber tosaid mixing chamber to form a primary-mix'- ture with air from saidfirst member, and meansv for carrying fuel from said float chamber tosaid second member to form a secondary mixture with air from said firstmember, said members being interchangeably mountable on either side ofsaid base.

6. In a carburetor, a float chamber, a base connected thereto, a memberhaving an air inlet, a second member having an air and fuel mixingchamber and a mixture outlet, said members being detachably securable toeither the upper and lower face of said base, and means for feeding fuelfrom said float chamber to said second member in either position.

7. In a carburetor, a float chamber, a base connected thereto, a memberhaving an air inlet and an air whirling device, a second member havingan air and fuel mixing chamber and a mixture outlet, said members beingdetachably securable to either the upper and lower face of said base,and means for feeding fuel from said float chamber to said second memberin either position.

HARVEY G. EBERT.

